Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Sonos - Era 300 | Sony - HT-A9 |
|---|---|---|
| Matter / Thread | true | false |
| Output | 0 W | 504 W |
Between the Era 300 and HT-A9, the Era 300 comes out ahead in matter / thread, while the HT-A9 wins on output. Overall, the Era 300 scores 65.4 and the HT-A9 scores 71.1 on our Mars Score.
Which should you buy?
The HT-A9 edges ahead on the Mars Score (65.4 vs 71.1), but the 5.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Era 300 if you care most about matter / thread. The biggest gaps in its favor are matter / thread. The single most decisive one: Has Matter / Thread.
Pick the HT-A9 if you care most about output. Its strongest claims are output. The single most decisive one: Output: 504 W vs 0 W.
Both ship with comparable dolby atmos, so those specs do not separate the two — focus on the differences below.
Bottom line: the HT-A9 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Sonos - Era 300 or Sony - HT-A9?
Sony - HT-A9 leads the current Mars Score by 5.7 points.The more useful decision is the trade-off behind that result: compare output, matter / thread against the way you will actually use the product.
Choose Sonos - Era 300 if…
Sonos - Era 300 has the measurable edge on has matter thread.
Choose Sony - HT-A9 if…
Sony - HT-A9 has the measurable edge on output w.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Sonos - Era 300 wins
- ▲Has Matter / Thread.
Why Sony - HT-A9 wins
- ▲Output: 504 W vs 0 W.
Spec comparison
Audio
| Spec | Sonos - Era 300 | Sony - HT-A9 |
|---|---|---|
| Output | 0 W | 504 Wlead |
| Stereo pairingⓘ | true | true |
| Dolby Atmosⓘ | true | true |
Assistant & Smart Home
| Spec | Sonos - Era 300 | Sony - HT-A9 |
|---|---|---|
| Voice assistant | Alexa,Sonos Voice | Google Assistant |
| Matter / Thread | truelead | false |
| Zigbee hub | false | false |